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Mike Phares
2024-11-01 11:47:29 -07:00
commit ebbc16ee6a
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120
NI-VISA/Examples/C/General/FindRsrc.c Normal file
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/*********************************************************************/
/* This example demonstrates how you might query your system for */
/* a particular instrument. This example queries for all */
/* GPIB, serial or VXI instruments. Notice that VISA is able to */
/* find GPIB and VXI instruments because the instruments have a */
/* predefined protocol. But serial instruments do not. Hence, */
/* VISA merely indicates that a serial port is available. */
/* */
/* The general flow of the code is */
/* Open Resource Manager */
/* Use viFindRsrc() to query for the first available instrument */
/* Open a session to this device */
/* Find the next instrument using viFindNext() */
/* Open a session to this device. */
/* Loop on finding the next instrument until all have been found*/
/* Close all VISA Sessions */
/*********************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include "visa.h"
static char instrDescriptor[VI_FIND_BUFLEN];
static ViUInt32 numInstrs;
static ViFindList findList;
static ViSession defaultRM, instr;
static ViStatus status;
int main(void)
{
/* First we will need to open the default resource manager. */
status = viOpenDefaultRM (&defaultRM);
if (status < VI_SUCCESS)
{
printf("Could not open a session to the VISA Resource Manager!\n");
exit (EXIT_FAILURE);
}
/*
* Find all the VISA resources in our system and store the number of resources
* in the system in numInstrs. Notice the different query descriptions a
* that are available.
Interface Expression
--------------------------------------
GPIB "GPIB[0-9]*::?*INSTR"
VXI "VXI?*INSTR"
GPIB-VXI "GPIB-VXI?*INSTR"
Any VXI "?*VXI[0-9]*::?*INSTR"
Serial "ASRL[0-9]*::?*INSTR"
PXI "PXI?*INSTR"
All instruments "?*INSTR"
All resources "?*"
*/
status = viFindRsrc (defaultRM, "?*INSTR", &findList, &numInstrs, instrDescriptor);
if (status < VI_SUCCESS)
{
printf ("An error occurred while finding resources.\nHit enter to continue.");
fflush(stdin);
getchar();
viClose (defaultRM);
return status;
}
printf("%d instruments, serial ports, and other resources found:\n\n",numInstrs);
printf("%s \n",instrDescriptor);
/* Now we will open a session to the instrument we just found. */
status = viOpen (defaultRM, instrDescriptor, VI_NULL, VI_NULL, &instr);
if (status < VI_SUCCESS)
{
printf ("An error occurred opening a session to %s\n",instrDescriptor);
}
else
{
/* Now close the session we just opened. */
/* In actuality, we would probably use an attribute to determine */
/* if this is the instrument we are looking for. */
viClose (instr);
}
while (--numInstrs)
{
/* stay in this loop until we find all instruments */
status = viFindNext (findList, instrDescriptor); /* find next desriptor */
if (status < VI_SUCCESS)
{ /* did we find the next resource? */
printf ("An error occurred finding the next resource.\nHit enter to continue.");
fflush(stdin);
getchar();
viClose (defaultRM);
return status;
}
printf("%s \n",instrDescriptor);
/* Now we will open a session to the instrument we just found */
status = viOpen (defaultRM, instrDescriptor, VI_NULL, VI_NULL, &instr);
if (status < VI_SUCCESS)
{
printf ("An error occurred opening a session to %s\n",instrDescriptor);
}
else
{
/* Now close the session we just opened. */
/* In actuality, we would probably use an attribute to determine */
/* if this is the instrument we are looking for. */
viClose (instr);
}
} /* end while */
status = viClose(findList);
status = viClose (defaultRM);
printf ("\nHit enter to continue.");
fflush(stdin);
getchar();
return 0;
}